(c) A coal-fired power station generates electricity at night when it is not needed.

Total lung capacity of a typical adult is approximately 5.0L. Approximately 20% of the air is oxygen, as air is 20% oxygen. At s

Tresset [83]

Answer:

n=0.03928 moles

Moles of oxygen do the lungs contain at the end of an inflation are 0.03928 moles

Explanation:

The amount of oxygen which lung can have is 20% of 5 L which is the capacity of lungs

Volume of oxygen in lungs =V=5*20%= 1 L= $1*10^{-3} m^3$

Temperature=T= $37^oC=273+37=310K$

Pressure at sea level = P= 1 atm= $1.0125*10^5 Pa$

R is universal Gas Constant =8.314 J/mol.K

Formula:

$n=\frac{PV}{RT}\\n=\frac{(1.0125*10^5) *(1*10^{-3})}{(8.314)*310} \\n=0.03928 mol$

Moles of oxygen do the lungs contain at the end of an inflation are 0.03928 moles

8 0

4 years ago

100 points!!!! Will mark brainliest!!!!!!!!

Scorpion4ik [409]

Answer:

Normal Force, Applied force, Gravitational Force, Spring Force

Explanation:

Normal Force so that he does not fall into trampoline, spring because the trampoline spring down when the force goes down, then up putting force upwards, gravitation because of gravity, and applied because of jumping

8 0

3 years ago

Read 2 more answers

In air, the 57 GHz radio wave has a shorter wavelength compared to the 64 GHz radio wave.

dalvyx [7]

Answer:

False

Explanation:

Higher frequency signals have shorter wavelengths. Hence, the 64 GHz signal will have a shorter wavelength than the 57 GHz signal.

Frequency and wavelength are inversely proportional meaning as frequency increases wavelength decreases and as frequency decreases wavelength increases.

Cheers.

6 0

3 years ago

A parallel RC circuit has a capacitive reactance of 962 ohms and a resistance of 1,200 ohms what is the impedance of this circui

Alex777 [14]

Answer:

A. 751 ohm

Explanation:

Impedance: This is the total opposition to the flow of current in an a.c circuit by any or all of the three circuit elements ( R, L, C). The unit of impedance is Ohms (Ω). The impedance in a parallel circuit is gives a s

Z = RXₐ/√(Xₐ² + R²)............................... Equation 1

Where Z = The impedance of the a.c circuit, Xₐ = capacitive reactance, R = resistance.

Given: Xₐ = 962 Ω, R = 1200 Ω

Substituting these values into equation 1,

Z = 962×1200/√(962² + 1200²)

Z = 1154400/√(925444 + 1440000)

Z = 1154400/√(925444+1440000

Z = 1154400/1538

Z = 750.59 Ω

Z≈ 751 Ω

Therefore the impedance of the circuit = 751 Ω

The right option is A. 751 ohm

6 0

4 years ago

- An impulse is equivalent to

Alik [6]

Answer:

c

Explanation:

impulse Is the product of force and distance so it's generally formula

5 0

3 years ago